Method of making tie-plates.



J. C. DILWORTH.

METHOD OFMAKING TIE PLATES.

APPLICATION FILED APR..24. 1917.

1,236,062. Patented. Aug. 7,1917.

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JOHN C. DILWORTI-I, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNORTO DILWORTH, PORTER & COMPANY, LTD., 0F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

METHOD OF MAKING TIE-PLATES.

Specification of Letters Patent.

Patented Aug. 7,1917.

Application filed April 24, 1917. Serial No. 164,104.

To all whom it may concern:

Be it known that I, JOHN C. DILWOR'IH, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have made a new and useful Invention in Methods of Making Tie-Plates, of which the following is a specification.

This invention relates to tie plates and more particularly to the art of making the same.

In U. S. Letters Patent No. 1,065,696 is sued to John Lundie on June 24:, 1913, certain form of tie plate is illustrated and described, and an object of this invention is to provide a method of making the same, in which method the operations are reduced to a minimum number.

For the purpose of more clearly describing this method I have shown certain drawings in which Figure 1 schematically illus trates this method and the manner of carrying the same into effect. Fig. 2 is a plan view of a tie plate adapted to be made in accordance with this method. Fig. 3 is a view in cross section of such plate and Fig. 4 is a view in sectional elevation of the same taken on line AA of Fig. 2 looking in the direction of the arrows.

The finished plates made in accordance with this method are provided with a rail retaining flange 10. a series of spike holes 11, preferably four in number, and a formed lower face 12 adapted to contact with the tie. The plate from edge 13 to edge 14 is cambered as shown in Fig. 4 and when in. use the camber is longitudinal to the line of the track.

In carrying out this invention, bars of suitable length and of suitable cross section, the cross section being similar, for example, to that shown in Fig. 3. are rolled from steel and then treated in accordance with this invention to produce finished tie plates.

A bar 15 having one surface provided with a rail retaining flange 10 placed downwardly is fed under a punch 16, composed of four punches and four dies, and four spike holes are simultaneously punched in the bar. The bar is then advanced a distance corresponding to the length (between ends 13 and 14) of the finished plate and another series of spike holes are punched. While the second series of spike holes are being punched and while the bar is held in position by means of the punch the portion of the bar having the first series of spike holes is cambered; this is done by causing pressure to be applied to the bar between support 17 and the lower portion 18 of shear knife 19 by means of a bender 20.

When the portion of the bar above the supports 17 and 18 has been cambered and bender 20 and punch 16 are raised, the bar is again advanced the length of the finished plate. The upper portion 19 of the shear knife and punch 16 are then'brought into play and a new portion of the bar is punched and at the same time the previously punched and cambered portion of the bar is sheared from the rest and a finished plate produced. WVhile the punching and shearing operations are in progress the punched portion directly behind the shear knife is being cambered.

From this method, which may be termed a continuous method in that a number of operations are simultaneously performed on the bar, it will be seen that the operations are reduced to a minimum number, as the cambering is being accomplished simultaneously with the punching and shearing operations. The punch and shear knife hold the bar in position and against movement while the cambering is done.

Having thus described my invention what I claim is:

1. The art of making tie plates from bars of proper cross section, which consists in punching a series of spike holes in the bar, advancing the bar so that its forward end projects beyond a shear knifeand then simultaneously punching another series of spike holes and shearing off the projecting forward end and while the bar is held in position by said punch and shear knife, bending a punched portion of said bar between said knife and said punch.

2. The art of making tie plates from previously formed bars which consists in punching a series of spike holes in the bar. moving the bar longitudinally over a support and so that a portion thereof extends beyond a shear knife, then punching another series of holes through the bar and simultaneously while the bar is held in position and against movement by the punch, bending the previously punched portion of the bar lyingabove said support and shearing off the portion projecting beyond the shear knife.

3. The art of making tie plates Which consists in rolling bars of suitable cross section, in punching a series of spike holes in said bar, then moving said bar longitudinally so that a portion thereof in advance of the punched holes extends beyond the shear knife, then punching another series of spike holes through the bar and simultaneously shearing oif the portion extending beyond the shear knife and While the bar is held in position by the punch and,v shear knife, bending a section of the bar between JOHN C. DILWORTH; Witnesses:

M. LAVELLE, EJMMA LEA MONTGOMERY.

Gopies of this patent may be obtained for five cents each, by addressing-the Commissioner ofjEat'ents Washington, D. 0. 

